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In the following blog post I'm going to show you how to create a custom control that uses one of the most powerful controls form Telerik. The control will allow you to populate the Rad Grid with items from different Generic Content providers and then manipulate the items from Sitefinity's front-end.
This enables you to sort data in the data source object as well as restrict the results returned from your data source object to only the requested page of data.First we need to create a template for our custom control.In this template I will put the following controls: In this template I subscribed for the On Client Load event of Rad Combo Box control.You can specify a name, type, direction, and default value for each parameter.Parameters that get values from a specific object, such as a control, session variable, or the user profile, require you to set additional properties.property, and based additionally on the parameter names that make up the business object method's signature.When you create methods in a business object, you must ensure that the parameter names and types accepted by the business object method match the parameter names and types that the collection; and so on.Net: You are trying to use a reference variable who’s value is Nothing/null.When the value is Nothing/null for the reference variable, that means it is not actually holding a reference to an instance of any object that exists on the heap. Net, you are trying to access a string that has not been initialized. You can’t even compile code like the following in C# Remember, a string is a reference type (a character array) that has to have a value.In previous tutorials we learned how the Object Data Source control allowed for inserting, updating, and deleting of data.The Sql Data Source control supports the same operations, but the approach is different, and this tutorial shows how to configure the Sql Data Source to insert, update, and delete data.